When you add an address, you will have to verify that it is indeed yours by entering the code the system sends you immediately. This protects against people making up addresses for spamming purposes or against people trying to impersonate others.

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You can also specify a different reply-to address for each of the addresses you set up.

This feature should help in fighting spam.Update: A reader suggests that your GMail address will still be visible in the header of your outgoing message and available to spambots so this feature may not help in fighting spam. If you are concerned about using certain addresses with some destinations (e.g. mailing lists), you can now specify different outgoing emails depending on the destination. The feature also makes it easier to filter incoming messages since you can now do so by the address to which a message was sent.